Dawg
I think there are two much more influential sources of this figure, one is the go to website for covid denialists, which is Offguardian
“Seven of the 12 inferred IFRs are in the range 0.07 to 0.20 (corrected IFR of 0.06 to 0.16) which are similar to IFR values of seasonal influenza. Three values are modestly higher (corrected IFR of 0.25-0.40 in Gangelt, Geneva, and Wuhan) and two are modestly lower than this range (corrected IFR of 0.02-0.03 in Kobe and Oise).”
But the origin of this quote comes from a paper by Ioannides.